RingCentral. I have a number from Canada and my phone rings in Thailand. Unlimited North America calling for $29 per month. I pay more because of my company's toll-free numbers, but for a standard package, $29 per month and you get your own number and it works wherever you have.
Bonus: RingCentral has the feature of unmasking blocked caller IDs.
Bonus: RingCentral has the feature of unmasking blocked caller IDs.